Gibraltar KN5C1750F7S--21 Lobed Knob 8-point 2.48in

Product Description

The GIBRALTAR KN5C1750F7S--21 is an 8-point lobed knob designed for hand-tightening applications on threaded fastener assemblies. It features a polypropylene inner core overmolded with thermoplastic elastomer (TPE) for a firm, comfortable grip without tools. The matte black finish reduces glare and resists surface wear. With a 5/16-18 threaded stem and 1.75 inches of thread length, this knob installs directly onto standard 5/16-18 threaded rods, studs, or machine bolts. It is suited for panel mounting, equipment adjustment points, and access door latching in light industrial, HVAC enclosure, and electrical panel applications.

This lobed knob is commonly used in applications requiring frequent manual adjustment or removal, such as access panels, cover plates, equipment guards, and control housings. The 8-lobe profile distributes hand torque evenly, reducing operator fatigue during repetitive adjustments. It is appropriate for both indoor light industrial and commercial service environments where a tool-free fastening solution is needed.

Key Features

• 8-point lobe profile for high hand torque and comfortable grip
• Polypropylene inner core provides structural rigidity
• Thermoplastic elastomer overmold improves grip feel and surface durability
• 5/16-18 threaded stem fits standard UNC fastener assemblies
• Matte black finish reduces surface glare
• Tool-free installation and removal

Compatibility

Designed as a direct-fit replacement or upgrade knob for any assembly using a 5/16-18 threaded stud, rod, or bolt requiring a hand-operable lobed knob with 1.75 inches of thread engagement.

Installation Notes

Installation requires no tools — thread the knob clockwise onto a 5/16-18 stud or bolt by hand until snug. Ensure the mating thread is clean and free of debris before installation. Do not use a wrench or driver on the lobed body, as this can crack the hub or strip the insert. Verify thread engagement depth matches the 1.75-inch thread length to avoid bottoming out.